Micrometer-calipers.



UNITED STATES Patented May 23, 1905.

PATENT OEEIcE.

FRANK SPALDING, PROVIDENCE, RHODE ISLAND, ASSIGNOR TO BROWN & SHARPE MANUFACTURING COMPANY, OF PROVIDENCE, RHODE ISLAND.

MlonowiEi-ER-CALIPERS.

SPECIFICATION forming part of Letters Patent o. 790,665, dated May 23, 1905.

i Application filed March 28, 1904:. Serial No. 200,315.

To a/ZZ whom, it 7am/y con/cern:

Be it known that I, FRANK SPALDING, a citi- ,zen of the United States, residing at Providence, in the county of Providence andState 'of Rhode Island, have invented a new and use- 'ful Improvement in Micrometer-Calipers, of iwhich the following is a specification.

` This invention has reference to an improvement 1n micrometer-calipers, and more particularly to an improvement 1n micrometer- 'calipers having dials indicating the readings V01"' the spindle and anvil are always in the same relative position with each other.

My invention consists in the peculiar and novel construction of a micrometer-caliper having approximatelya U-shaped mainframe with an offset handhold; an anvil in the frame;

an internally-screw-threaded sleeve formed integral with theframe; a spindle extending through the sleeve and frame in alinement with the anvil; apointer secured tothe outer end oi' the spindle; a barrel on the spindle having an inner tube in screw-thread engagement with the sleeve and an outer shell surrounding the sleeve; means for rotatably securing the barrel to the spindle; a lznurled ring on the barrel engaging with the barrel' through a'clutch; a dial-frame supported on the barrel and on the main frame by a sliding pin; a slip-gear dial secured. to the end of the barrel in the dial-frame; a gear-dial pivotally secured in the dial-frame in a position to engage with the slip-gear dial; lines and numerals on the slip-gear dial indicating units of measurement, such as one'totwenty-five one-thousandths of an inch; numerals on the gear-dial indicating units of measurement, such as twenty-five to three hundred onethousandths of an inch; a cover secured to the dial-frame over the dials, having openings through which the lines and numerals on the .dials are easily seen, and other details oi' construction, as will be more fully set forth hereinafter.

My improved micrometer-caliper is particularly adapted for calipering sheet metal or other sheet-stock, but may be used for calipering wire or other articles, if desired.

Figure 1 is a side view of my improved dial micrometer-caliper. Fig. 2 is an end view of the same, showing the dials. Fig. '3 is an 60 enlarged sectional view taken lengthwise through the caliperv on a line with the spindle. Fig. 4 is an enlarged view of the dial end of the caliper, showing the cover of the dialfrarne removed. Fig. 5 is a detail sectional 65 view taken on line X X of Fig. l, showing the splines in the frame engaging with the grooves in the spindle to hold the spindle from rotating; and Fig. 6 is a detail sectional view taken on line Y Y oi' Fig. 3, showing 70 the construction of the clutch through which the knurled ring operates the barrel.

In the drawings, t indicates the frame; the anvil; c, the spindle; d, the barrel; e, the lnurled ring; f, the dial-frame; g, the driving slip-gear dial, and /t the driven gear-dial.

The frame a is formed approximately U- shaped, with the offset handhold a, in which is the hole a2, bored parallel with the spindle 0, the outer arm a3, in the end oi' which is the 8O .anvil b, and the inner arm a, on which is the internally-screw-threaded sleeve a5, formed integral with. the arm, asV shown in Fig. 3. The hole a extends through the arm finto the sleeve a5, and the oppositely-disposed splines c7 a7 extend into the hole a, as shown in Fig. 5.

i The spindle c has the reduced portion c', forming the shoulder c2, and the grooves c3 03, coinciding with the splines a7 @7, which coacting togetherprevent rotation of the spindle. The cap cet is secured on the inner end of the spindle by the pin c5, and the pointer 06 is secured on the outer end of the spindle by the screw c7.

The barrel CZ has the central hole d', through 95 which the reduced portion c of the spindle extends, the inner tube cl2, which extends into and is in screw-thread engagement with the internal screw-thread in the sleeve a5, the outer shell d3, having 'its inner end enlarged to form a shoulder in 'which is the groove (Z4, and extending inward from the groove Z4 is the hole d5, in which is the spring-pressed pawl CZ, as shown in Fig. 3. The outer end of the barrel rZ is stepped to form the shoulders (Z7, (ZS, and (Z9.

The lznurled ring e is rotatably supported on the barrel d and has the saw-teeth e e' on its inner end, which enter the groove Z4 in the barrel d and engage with the springpressed pawl d, forming arclutch between the ring and the barrel. The tension of the spring-pressed pawl Z6 on the angle of the teeth e' is suiiicient to revolve the barrel (Z and move the spindle inward. When the spindle comes to a stop on the article to be calipered, the teeth c ride over the pawl (Z6, but lock with the pawl in the reverse movement to move the spindle outward. The ring e is separated from the dial-framef by the washer e2 on the barrel CZ.

The dial-frame f consists of a shallow box shaped to hold the dials g and 7L and supported on the outer end of the barrel (Z between'the shoulders Z7 and CZ8 through the hole f 2 in the dial-frame. The pin f is secured to the dialframef in a position to enter the hole a2 in the frame a in which it slides. The cover f3, having the opening f4 Jfor the dial g and the opening f5 and the aperture f6 for the dial Zt, is secured to the dial-frame f by the screws f7f7, as shown in Fig. 2.

The driving slip-gear dial g in the frame f has the tooth g' on its periphery and is secured on the outer end of the barrel d between the shoulders d8 and d by the nut g2 and the lock-nuts g3 g3, in screw-thread engagement with the end of the barrel which extends through a central hole in the dial. The face oi' the dial g is divided into twentyfive equal parts by lines which are numbered as shown in Fig. 4.

The driven gear-dial /L has continuous teeth on its periphery and is pivotally secured to the dial-frame f by the screw-stud ZL through a central hole in the dial in a position for the tooth g on the dial g to engage with the teeth on the dial Zi and move it one-thirteenth of a revolution. The driven gear-dial /L is divided into thirteen equal parts, on which are numerals reading by twenty-fifths from O to 300, which are exposed successively through the aperture f6 at each revolution of the dial g, as shown in Fig. 2.

When the parts of my improved dial micrometer-caliper are assembled, the spindle c extends through the hole a6, the internallyscrew-threaded sleeve a5, and the central hole Z' in the barrel (Z, the barrel Z being rotatably secured on the reduced portion c of the spindle, between the shoulder c2 and the locknuts g3 g3, as shown in Fig'. 3.

By this novel construction and arrangement of the parts the revolving of the barrel (Z by the ring e moves the spindle c lengthwise, and with it the dial-framef and the dials -r/ and rIhe dial g, revolving with the barrel (Z under the fixed pointer c, intermittently rotates the dial Zt. The pinf', sliding in the hole a. in the main 'frame a, holds the dial-frame f in its relative position with the main frame.

It is evident that the construction of my improved dial micrometer-caliper could be altered to give any readings ou the dials f/ and ZL desired without materially aliecting the spirit ot' my invention.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. In a micrometer-caliper, aframc, a screwthreaded sleeve on the frame, a spindle extending through the frame and the sleeve, means connecting the frame with the spindle to prevent rotation of the spindle, a barrel rotatably secured to the spindle and in screwthread engagement with the sleeve, a drivingdial secured to the outer end of the barrel, a pointer secured to the outer end of the spindle over the driving-dial, a driven dial, means for pivotally securing the driven dial, and means on the dials adapted to give an intermittent motion to the driven dial, as described.

2. In a micrometer-caliper, a main frame, an internally-screw-threaded sleeve on the frame, a spindle extending through the frame and the sleeve, means connecting the cframe with the spindle to prevent rotation of the spindle, a barrel rotatably secured to the spindle and in screw-thread engagement with the sleeve, a dial-frame supported on the outer end of the barrel and on the main frame, a driving-dial secured to the outer end oiE the barrel in the dial-frame, a pointer secured to the outer end of the spindle over the drivingdial, a driven dial pivotally secured in the dial-frame, and means on the dials adapted to give an intermittent motion to the driven dial, as described.

3. In a micrometer-caliper, the combination with a main 4frame having an internally-screwthreaded sleeve formed integral with the frame and a hole extending through the frame into the sleeve, of a spindle extending through the hole in the frame and the sleeve, means connecting the frame with the spindle to prevent rotation of the spindle, a barrel rotatably secured to the spindle and in screwthread engagement with the sleeve, a knul-led ring rotatably secured to the barrel, means for rotating the barrel by the ring to move the spindle lengthwise, consisting of teeth on the ring engaging with a spring-pressed pawl in the barrel forming a clutch, a dial-frame supported on the outer end oi' the barrel through a hole in the dial-frame and connected to the main frame by a sliding pin, a driving-dial secured to the outer end of the barrel in the dial-frame, a pointer secured to the outer end of the spindle over the driving-dial,

IOO

IlO

a driven dial pivotally secured in the dialframe loy. a screw-Stud, means on the dials for giving an intermittent motion to the driven dial, consisting of a tooth on the driving-dial engaging with teeth on the driven diaL'lines and numerals on the dials indicating units of measurement, and a cover on the dial-frame having apertures through which the lines and numerals on the dials are easily seen, as described. f

4. In a micrometer-caliper, the combination of the frame c, the anvil the spindle c, the

barrel d, the knurled ring e, the dial-framef, the driving slip-gear dial g, andv the driven gear-dial/L, all constructed as shown and for the purpose as described.

In testimony whereof I have signed my name to this specification in the presence of tWo subscribing Witnesses.

FRANK SPALDING.

Witnesses:

ADA E. HAGERTY, J. A. MILLER, Jr.A 

